HK Legend

I recently acquired an HK Legend that needed some work done to it. As of now I am attempting to take off the front block, but the screw that locks the block in place is somewhat underneath the air hose fitting, and thus won't come off... This a common problem with HK Legends? Any ideas?

Edit: Also, with the soft tip bolt I ordered it came with a "bumper" oring for the rammer. Is this necessary, and if so, is it supposed to be placed on the recessed/groove area on the front half of the rammer (hard to describe w/o pictures)?